Share 10.) Subtraction to 20
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17 - 6
9
10
8
11
20 - 3
15
17
16
14
14 - 4
8
10
7
9
19 - 7
11
9
10
12
12 - 2
9
10
8
7
18 - 5
11
10
12
13
16 - 1
13
14
15
12
15 - 3
12
10
11
9
13 - 0
13
10
12
11
20 - 9
9
10
8
11
11 - 1
8
7
10
9
19 - 2
13
15
16
17
18 - 8
10
7
8
9
17 - 4
11
12
13
10
14 - 1
12
13
11
10
16 - 6
9
10
6
8
